Input type file check image resolution using pure Javascript

Question

I have created a type=file input element

<input type="file" id="input-id" accept="image/jpg" onchange="verifyFileUpload(event)">

I need to check that the file resolution is aXb using pure Javascript. How can I do that in the verifyFileUpload(event) function?

Possible duplicate of https://stackoverflow.com/questions/8903854/check-image-width-and-height-before-upload-with-javascript — clabe45, Oct 03 '18 at 12:25
This questions has lot of answers online, even on stack overflow, please consider doing a quick search before posting a question. also Possible duplicate https://stackoverflow.com/questions/12570834/how-to-preview-image-get-file-size-image-height-and-width-before-upload — Wasim Sayyed, Oct 03 '18 at 12:32

score 8 · Accepted Answer · edited Jul 12 '19 at 08:27

Try the below way

window.URL = window.URL || window.webkitURL;

function verifyFileUpload(e)
{
  var file = document.getElementById("input-id");
  
  if (file && file.files.length > 0) 
  {
        var img = new Image();

        img.src = window.URL.createObjectURL( file.files[0] );
        img.onload = function() 
        {
            var width = this.naturalWidth,
                height = this.naturalHeight;
                
          console.log ("Image Width: " + width);
          console.log ("Image Height: " +height);
        };
    }
}

<input type="file" id="input-id" accept="image/jpg" onchange="verifyFileUpload(event)">

Input type file check image resolution using pure Javascript

1 Answers1